code: def unknown_visit(self, node: Node) -> None:
      pass
  
imports: from __future__ import annotations
  import sys
  from typing import TYPE_CHECKING, Any, NamedTuple
  from docutils import nodes
  from pygments.lexers import PythonConsoleLexer, guess_lexer
  from sphinx import addnodes
  from sphinx.ext import doctest
  from sphinx.transforms import SphinxTransform
label_desc: Use image node_id 2 for calling the HighlightLanguageVisitor obj's underlying member method code with example usage: obj.unknown_visit(node) without return types